GLACIERS OF PASSAGE CANAL AND BLACKSTONE BAY 859 deposit,—a moraine rising 210 to 474 feet above the fiord bottom and all submerged excepting the top,—or (2) a thin superficial deposit, resting upon a rock swell, cannot be determined from the facts at hand. The lack of thick corresponding deposits upon \ PIG. 58. GLACIERS AND STJBMAKHTH CONTOUBS OF BLA.CESTONB BAT. Soundings in feet. Photographic stations shown by letters C, D, and E. Willard Island and in the fiord to the west of the island suggest the latter. The broadening of the eastern passage just here also accords with this view, for glacial erosion would naturally be efficient in the constriction to the south (462 to 468 feet deep), and the incoming of the steeply-descending Ripon Glacier might have caused a plunging of the ice and an increased efficiency of erosion to the north where the depths are 474 to 936 feet.